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There's no traditional credit list.
At the end of the film there is a credit for additional footage to Killian Shows, Inc and a production credit to Documentary Interlock, Inc. However a search doesn't turn up a connection with current companies using similar names.
Producer: Abbie Hoffman
Script: Paul Krassner
The pitchman for the Yippie helmet was Marshall Efron.
The Yippie head was that of Bob Fass.
Keith Lampe was the narrator.
The song "I Ain't A Marching Anymore" was written and sung by Phil Ochs.